It is one of the frequent errors of Outlook that arises when the Outlook doesn’t sync with the exchange server. There may be many reasons for that. You can fix this error code 0x80072f06 in Outlook by using some of the manual methods as well as automated method.
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Moreover, you can try this way, click on the Start menu (Search box), then click Run & type as, outlook.exe / safe eventually. Next click on OK.