Unlocking Bitlocker Drive in Windows Professional

Whilst Windows Professional does not support encrypting using bitlocker, any version of Windows 7 can unlock pre-existing bitlocker drives going by the following technet article:
https://technet.microsoft.com/en-us/...spx#BKMK_Vista

My observation generally correlates with the above. In fact saying Win Pro does not support bitlocker encryption is not correct. I commenced bitlocker encryption on a Windows Ultimate machine, paused it part way through and connected into my Windoes Professional machine and it continued encrypting the device from where it left off!

Question: upon unlocking a bitlocker encrypted drive on a Windows Professional machine, will files I write to it be correctly encrypted as if the same files were being written from a Windows Ultimate machine?

I would seem so.

There's a big difference between unlocking a pre-existing bitlocker drive as compared to encrypting a drive with bitlocker using Windows 7 Pro. Also, the Technet article you referenced says "...you can unlock encrypted removable drives on any version of Windows 7." Based on the fact that bitlocker is not officially supported on Windows 7 Pro, and that Microsoft says only encrypted removable drives can be unlocked, it seems these two caveats alone would make using bitlocker on a Windows 7 Pro machine dicey.

In the alternative, have you considered using a free third party encryption tool like VeraCrypt (which is based on TrueCrypt's coding?) Personally, I wouldn't use an unsupported encryption tool (bitlocker) and risk not being able to access my important files or drives. Just some personal opinion and certainly not meant to be argumentative.

3 Alternatives to the Now-Defunct TrueCrypt for Your Encryption Needs

https://veracrypt.codeplex.com/

Appreciate prompt reply.

Yes I was referring to external drives using bitlocker to go.

OK so Win 7 completes the encryption process (after I commenced it on Win Ultimate). Then if I execute the following command on the drive (either on Win 7 or Win Ultimate) it indicates "Percentage Encrypted: 100%" (even after writing new content from Win 7):
manage-bde -status

What risk am I running here that files written to on Win 7 aren't fully encrypted? All indicators indicate it's fully encrypted.

What risk am I running here that files written to on Win 7 aren't fully encrypted? All indicators indicate it's fully encrypted

I guess I'm just overly cautious about using unsupported tools/software whether it be an encryption tool or something else. If something can go wrong it usually happens to me. :)

Don't follow your logic Roland. Drives can be unlocked on either my Win 7 Pro or Ultimate machines.