Email Scam

I received an email this morning purporting to be from BT about a software upgrade with a link to click. What roused my suspicions was where it said it's obligatory. I haven't clicked the link and have reported it to BT. If it is a scam, which I'm sure it is, there will be a lot caught out....

Dear Customer,

Technical services of the XXXXX are carrying out a planned software upgrade.
We earnestly ask you to visit the following link to start the procedure of confirmation on customers data.
To get started, please click below:

XXXXXXXXX

This instruction has been sent to all our customers and is obligatory to follow.

Thank you,
Customers Support Service.