Hi Everyone Working on a client request to fix a retention policy that was setup wrongly we faced a PST limitation size during EXO export. By default Exchange Online eDiscovery Export Tool limits PST size to 10 GB which means if your mailbox has more than 30 GB of size you’ll have an export with 3 PST files of 10 GB each.   After first export we had the following: Fix – Registry File

1. close eDiscovery Export Tool
2. copy and paste registry key below and save as PstExportSize.reg , where “34359738368” corresponds to 32 GB mailbox (we exported all mailboxes sizes before we kicked this export to make sure we would have 1 PST file for the entire mailbox to be exported) – If you like Excel use this spreadsheet as cheat sheet. Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Client\eDiscovery\ExportTool] “PstSizeLimitInBytes”=”34359738368”
3. double click on it as local admin on the workstation you’re running this task
   1. we tested on Edge and IE (Internet Explorer) to make sure the eDiscovery Export Tool was working fine before we used this fix.

Registry key on Notepad++ References https://docs.microsoft.com/en-us/microsoft-365/compliance/limits-for-content-search?view=o365-worldwide#export-limits https://docs.microsoft.com/en-us/microsoft-365/compliance/change-the-size-of-pst-files-when-exporting-results?view=o365-worldwide Check my Github repository Thanks, Thiago Beier