actually i am trying to megrate from  Exchange server 2003 to Exchange 2010 and i run microsoft Exchange Best Practice analyzer: and i end up with the following errors: [table width="800"> [tbody] [tr] [td bgcolor="gray">Critical Issues [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="30" valign="bottom" width="800">Items of severity Errors [/td] [/tr] [tr] [td bgcolor="black" height="1" width="800">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">'SystemPages' set too high[/td] [td width="334">Server: pm-s-be01[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">The 'SystemPages' value is set too high on server pm-s-be01.mediu.edu.my and may cause instability. Current value: 798720.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">'SystemPages' set too high[/td] [td width="334">Server: pm-s-be02[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">The 'SystemPages' value is set too high on server pm-s-be02.mediu.edu.my and may cause instability. Current value: 798720.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">'SystemPages' set too high[/td] [td width="334">Server: PM-S-FE01[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">The 'SystemPages' value is set too high on server PM-S-FE01.mediu.edu.my and may cause instability. Current value: 798720.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">'SystemPages' set too high[/td] [td width="334">Server: PM-S-FE02[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">The 'SystemPages' value is set too high on server PM-S-FE02.mediu.edu.my and may cause instability. Current value: 798720.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">3GB is not set[/td] [td width="334">Server: pm-s-be01[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">Exchange mailbox server pm-s-be01.mediu.edu.my has 1 GB or more of memory, accommodates 339 mailboxes, and does not have /3GB set in the Boot.ini file. Greater scalability would be achieved if this were set. Memory detected: 3325 MB.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">3GB is not set[/td] [td width="334">Server: pm-s-be02[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">Exchange mailbox server pm-s-be02.mediu.edu.my has 1 GB or more of memory, accommodates 339 mailboxes, and does not have /3GB set in the Boot.ini file. Greater scalability would be achieved if this were set. Memory detected: 3325 MB.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">'HeapDeCommitFreeBlockThreshold' not set[/td] [td width="334">Server: pm-s-be01[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">Server pm-s-be01.mediu.edu.my has 1 GB or more of memory, accommodates 339 mailboxes, and the 'HeapDeCommitFreeBlockThreshold' parameter has not been set to 262144. Virtual memory may become quickly fragmented and system instability may occur.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">'HeapDeCommitFreeBlockThreshold' not set[/td] [td width="334">Server: pm-s-be02[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">Server pm-s-be02.mediu.edu.my has 1 GB or more of memory, accommodates 339 mailboxes, and the 'HeapDeCommitFreeBlockThreshold' parameter has not been set to 262144. Virtual memory may become quickly fragmented and system instability may occur.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">Virtual memory error[/td] [td width="334">Server: PM-C-EXC01[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">The 'VM Largest Block Size' on server PM-C-EXC01 is reaching a critical level and may cause reliability problems. Current largest block size is 33 MB. The Microsoft Exchange Information Store (store.exe) process has been running for 16 days.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">Database backup critical[/td] [td width="334">Server: PM-S-FE01[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">Database 'Public Folder Store (PM-S-FE01)' on server PM-S-FE01 has never had a full online backup.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td bgcolor="black" height="1">[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="450">'MaxPageSize' is set too high[/td] [td width="334">: Active Directory Sites[/td] [/tr] [/tbody] [/table] [table border="0" width="800"> [tbody] [tr] [td height="16" width="16"> [/td] [td width="784">The maximum LDAP page size for the default query policy is set too high and may cause performance problems. The default of 1000 is recommended. Current value: 5000.[/td] [/tr] [/tbody] [/table] [table width="800"> [tbody] [tr] [td width="32"> [/td] [td width="500"> Tell me more about this issue and how to resolve it. [/td] [/tr] [/tbody] [/table] and there was alot of non critical errors i don't want to mention. when i search google i found alot of articiles to change registry keys, and i am really afraid because it is production environment. can any body suggest sloutions for the errors and the severity

Software/Hardware used:
Windows Server 2003