I was performing a PST e-mail import task for a migration being done recently.  The user’s PST files were larger than the mailbox quota limits set at 200 MB.  Once the import reached 200 MB of data, it stopped and gave me an error in powershell. 

After examining the quota limit on the mailbox, I increased the size and tried the import again.  It kept failing immediately and the logs showed that the quota limit had been reached. 

After some searching, I found out that there is a waiting period between changing the quota limit and it actually taking effect.  To make the change happen immediately, I found that you can restart the Microsoft Exchange Information Store service, and it will update the quota limits on the mailbox.