Where is my e-mail????

I'm not getting mail from safe contacts.  The questions (and responses) pertaining to this all date from earlier in the year.  It's only been in the last couple of weeks that I've had the problem.  What IS the proiblem?  I've gone through all the steps previously suggested, and everything is supposedly working right.  Did Windows give me an upgrade that's causing the problem?  And don't tell me to check with Windows.  Microsoft is so monolithic it's hard to imagine they don't have their hand in that, too.