I am going to be resyncing a Gmail account in Outlook for someone. There are multiple .pst data files that in total add up to around 40GBs of data. One file is 15GBs, another 12GBs - I am not sure why they are so large in size.


Anyways, is it possible to merge all of these data files together?


The reason for the resync is because there are some instances where a folder will be labeled as "This Computer Only," and someone had said that the way to fix this would be to backup all your data and then resync things again.