Thank you, Adam, for posting a warning of yet another scam. By publishing this in an open forum, we get to alert our users to yet another of the many ways that scammers try to get money out of people.
For those not sure how to know that the above was a scam, may I point out that IF this were an official government office from the UK...
1. They almost certainly would NOT have a .COM domain address. They would have either a .UK domain or a .UK.GOV domain address.
2. The "reply to" would not be a gmail.com address. It would be a .UK.GOV or .UK address. An official office will probably have its own Exchange servers so you might expect to see "Exchange" in the address. Further, you would be able to do a web search for the address to see from where it originated.
3. If Microsoft were actually involved in this, the "signed by" and "via" elements would not include onmicrosoft.com because true messages from or through Microsoft would include .microsoft.com, not some bastardized reference that tries to LOOK like Microsoft is involved. Further, the "signed by" would be a legitimate signer in either the .UK or .UK.GOV domain. TRUST me on this fine point. Official UK offices have the ability and authority to issue their own digital certificates.
4. The real indicator of "wrongness" is that sentence that offers to "guide you through" some process of getting money that you never knew you even were owed. This will be an excuse to get your bank routing number, which will open you up to having your bank account drained to zero.
Thank you for the information, Adam.