I've had an email account, **@live.com, for a few years without any problems at all.  However, accessing my account over the last couple of days on my iPhone I've noticed that mails in my Inbox only got back 1 week.  I've checked all the settings and they are set to 'no limit'.  My sent box and other folders go way back, just my Inbox that appears to have been affected.  It's the same if I access my account on my computer using an internet browser - Inbox mails only go back a week.