Google Apps for Microsoft Outlook (GASMO) being used (IMAP). This creates a local pst file.

The local file size is approaching 50GB, and regularly needs repairing (scanpst) - (yeah, I know, it's scary).

I realize I am pushing Microsoft's storage boundary by a big margin, and it is not practical, since the pst will continue to grow.

Prefer not to change Max Size settings in Registry, but would rather find a solution whereby I can decrease the local pst size to a more stable size which does not require frequent repairs, without affecting the contents of the mail on the GMail Server.

This would mean the Client can only view mail in Outlook from a particular date onwards, which they will have to accept.

Clients are fixed in their Email habits and unwilling to use Googles Webmail, which would be the obvious way around this problem.

BTW - locally archiving mail is not an option, to cut down pst size, as GMail for work does not Sync Archived mail in Outlook.

The company's Email is vital, and their historical mail (which goes back 16 years) is a Corporate Legal, as well as Work requirement, so although I have backups to the Cloud + Local Storage + Offsite Hard Storage, I do not wish to lose any email from Googles Mail Server, if I prune the local pst file, and Archive alot of my clients Email locally, because after Archiving, I will have to delete the huge local pst and resync with Googles Server all over again in order for Google to recreate the now smaller pst file. However, I fear I will lose historical mail that sits on Googles Server once the Sync is complete, because it will replace mail on its Server with mail that is left over after the archiving is done in Outlook.

Hope this makes sense.