Hello and welcome to justanswer. My name is***** will be assisting you today. I am sorry to hear that you are having such trouble. I will try my best to help you.
Could you please provide the following details.
After you purchased office 365 did you get a email regarding the purchase ?
What type of document are you trying to open,is it a word,excel file?
Which is the operating system installed in the PC.Is it Windows Vista, Windows 7, windows 8, Windows 10 ?
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Please answer my above questions so that i can help you better.
Checking to see whether you still need help.
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Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.I am sorry to hear that you are having such trouble. I will try my best to help you out and resolve the problem as quick as possible.
Let me know when you could be online and available.