Whereas it is quite easy to set or change the location of pst-files belonging to a POP3 account, changing the location of the ost-file for an Exchange, Outlook.com or IMAP account is much more troublesome.
This can lead to issues as these files can grow quite large and the disk or partition on which you have Windows installed might not be accommodated for that. Especially if you invested in a fast SSD-drive, you usually don’t have GBs of space to waste and rather locate this data on your larger data drive.
While you can force the location of ost-files via Registry value, you’ll need to remove and re-add the account and download all mail again.
An effective and more direct solution is to use Symbolic Links. While the matter around them and how they function is quite complex, using them is luckily fairly easy and they are a very effective solution for this issue.
Continue reading: Moving the ost-file of an Exchange, Outlook.com or IMAP account