Migrating from a 3rd party server

Hi All

I am currently planning a migration away from a 3rd party Exchange 2010 server (which I have no access to) to my internal Exchange 2013 box. It will be around 80 mailboxes. My expectations are that the 3rd party will run a New-MailboxExportRequest command and supply my with the mailboxes in .pst format. I will then run New-MailboxImportRequest to import the pst's into my ready and waiting exchange/mailboxes. Its just occurred to me that I am likely to lose email autocomplete/quickparts/signatures but want to check if this is correct and if there is anything I can do to retain this data

Any advice would be appreciated

thanks