Office 2010 mailbox >50GB
Outlook 2010 should not be used with mailboxes over 50GB
Although Microsoft Hosted Exchange mailboxes of 100Gb or more are available (Hosted exchange Plan 1 – 50GB, Hosted Exchange plan 2 – 100GB), it is advisable to upgrade to the latest version of Outlook (Office 365 or Office 2019) if your mailbox size exceeds 50GB
By default, Personal Folders (.pst) and offline Outlook Data File (.ost) files are in Unicode format in Microsoft Outlook 2010 and Outlook 2013. The overall size of .pst and .ost files has a preconfigured limit of 50 GB.
This limit is larger than the limit for Unicode .pst and .ost files in Outlook 2007 and Outlook 2003. The new Outlook file size limit of 50 GB can be increased or decreased by making changes to the Windows registry.
For more information, click the following to view the article in the Microsoft Knowledge Base:
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