Is there an way to solve error outlook 2010 PST file has reached maximum size? I faced with this error message last week while working in Outlook 2010. This error message makes me clear that I have to delete some PST file. I did not want to delete data from Outlook 2010 but due to this error message I deleted some data. But after deleting data, I constantly get this error message and I am too much worried now. If anyone have solution to solve error outlook 2010 PST file has reached maximum size then please suggest me!