I would counsel you to read my article about the downfall of Jerome Kerviel especially the bits about sharing passwords and being left out to dry if it goes completely tits up.
My article was 9 years ago and from the 17.2 million hits it got, some people claimed my analysis was wrong and this stuff doesn't happen any more
.. They said this in 2008.
One thing that would send compliance in fits is that they have left a live trader workstation.
This implies that it wasn't backed up (in case the trader was bad and you need evidence) and then deleted with extreme prejudice.
Most traders are reasonably IT literate, some have written serious texts on programming, he could
have left nasties behind, maybe even remote login. Probably not, but the hole is deep if it exists.
Tha'ts basic1980s security, I'm hopeful it will become standard before the end of this century ;(
So what can you do ?
Make a fuss and you risk your hard fought for entry level job.
You need Connor's zeroth law of fuckups.
Make sure your arse is covered. Drop a gentle email to your boss, not in any way confrontational, just gently asking when you will get your own account. Print it out
I'd attempt to speed up the process by finding some good and pressing reason for your management to defuck this situation. Maybe there is a program you need to run that requires the IT guys to reconfigure your system, maybe it keeps crashing, maybe you accidentally cover up the heat vent and the PC dies.
I hear what you say about the email. I'd be tempted to simply delete Outlook from your system., In a properly configured workstation you can't do that, but given their competence so far, I'd bet you could.
I believe I have a reputation for discretion, so if you want an offline chat an email to my name at gmail will contact me.