Something kind of similar happened to me. I paid A LOT of money for an all singing, all dancing version of the office package, installed it on my laptop, hardly used most of the applications, other Outlook, Word & Excel for six months, then my laptop got half inched. When I got a replacement sorted out and tried to re-install the Office package, I could not find the product key for love nor money.
Microsoft were happy to help, if I was happy to pay £29.99 for half an hours telephone assistance, plus another £49.99 for a new product key.
I was not happy and I declined their offer to help. I spoke to Trading Standards and they told me I was buggered.
I was somewhat distraught.
Then a friend pointed me in the direction of
Open Office, a free package of office alike applications (not unlike the Libre Office mentioned above) and the email app
Mozilla Thunderbird.
I've been using these two free downloads for the best part of three years now and I have no complaints with them bar one, why didn't my friend mention them before I spent £400+ on F-ing Mircosoft Office?!?
So unless you can get a volume licence key from work, my advice is
BUGGER MICROSOFT and go for a free office suite (plus Thunderbird if you need an email app).
Good Luck