just a few weeks ago we had a user that was using the 60 day trial version of 2013 office and when they downloaded and installed full version with valid microsoft keycode, their outlook 2013 started having problems sending out emails. It keeps getting stuck in their outbox and only way to get them sent is to logoff of outlook then log back in. I researched and a lot of people seems to be having same issues with outlook 2013 and said it was a bug but strange thing is why why is it working for 2months with the trial version? Anyway, it seems that if the user sends out using groups then it gets stuck right away but if they send out emails individually, then she seems to have better luck. I actually tested it by also creating a new email account within same outlook but used different pst and i could send 5 individual emails to my own account but once she tried sending groups then gets stuck in outbox. Any ideas? I also removed all add ons as in the past i have seen that having unecssary add ons in outlook 2010 even caused problems with sending emails.