Outlook 2010 should not be used with mailboxes over 50GB

Although 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 or Office ) if your mailbox size exceeds 50GB

By default, Personal Folders (.pst) and offline Outlook File (.ost) files are in Unicode format in Microsoft Outlook 2010 and Outlook . The overall size of .pst and .ost files has a preconfigured limit of 50 GB.

See here

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:

Office 2019/Office 365 Pricing and Products Explained

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