Question: outlook pst folder has reached maximum size?
Answer: In Outlook 2010, 2013 and 2016, this recommended limit has been set to 50GB. You can increase (but also decrease) this limit via the Registry or via Group Policies. Note: This tip does not apply to pst-files and ost-files which are in the Outlook 97-2002 format (ANSI formatted pst-files).