No. PST's aren't allowed to reside on the fileshare. There's good reason for this. PST's get huge, into the GBs. You really should try to keep them below 2Gb or they start to corrupt. You can keep organizational PST's on the share. Legit org, like a flight's org box or a CSS org box. Plus those legit boxes can get increased size as well. Talk to your CS.
Additionally your file share.. clean that shit out fellas and ladies. We're doing scans at the wing king's direction and there's so much duplicated data that's just eating space. I know to you guys it's "free" but imagine if that was paper docs. That space is precious to us for numerous reasons below.
1) Regulations - Your electronic records should be filed in accordance with your file plan. A fair chunk of your emails probably could be filed under this. The CS is required to make sure the ERM drive is big enough to support that. We are not required to maintain the Share Drive. That's right. The ERM drive and Share Drive both run off the same equip. Which leads to more problems -
2) Tech Challenges - Sure, we could connect a 3TB disk via usb to the SAN (Storage Area Network has diagrams). It'll void the storage array warranty (haha, just kidding. ACC didn't pay for it to be continued, but didn't bother to tell us.) The storage stuff isn't as easy as plugging in another hard drive. The APC have had problems because they populated storage arrays with different speed disks (ex. 10K vs 5Krpm) and its causes write/read errors. There are whole certifications around the management of data and data storage products.
Just look at the product break down here - EMC Toys
So, we have to get vendor approved hard drives, installed by trained professionals (i.e. generally not my Amn) and expand the arrays through their software tools.
Now, we can buy more drives. Except that they're usually red/business/special and cost much more than your normal drive. Here's a EMC approved 15K RPM, 1.7TB drive.. for ~$14K. Much like our aircraft I can't pop down to Frys/Best Buy and stick any hard drive in this specialty equipment.
3) Programming Challenges - I don't mean code, I mean money. Your base stuff is old (probably). Almost all of our expansion/new stuff is fought over at end of year. I'm not going to get into how much of my current bases equipment is pushing against the EOL/EOS. Just this year the AF decided to move off of Windows Server 2003. Why? Because MS said they were going to charge millions for continued patches past the July drop dead date. Even this move was couched with "show us if you really need it and we might pay."
This is a double impact. I can't get a new array when it starts failing, because Comm/Cyber support equipment doesn't get regular updates from MAJCOM/HQAF. We fight for end of year funds to make sure we can expand services (VoIP) or continue with vendor warranties and/or equip. Imagine if you had to fight for F16 block upgrades at end of year against the new gym/finance offices. Kinda like that.
Remember when I said we weren't required to support a shared drive? This is why. If we were, it might get programmed against.
4) Old. Sure I kinda mentioned this before, but think about how well old hard drives work. Touchy, special dedicated hard drives. I've no kidding seen a 50% disk failure rate on a base's share drive array. And the only thing you can do is plunk down more $$$ and hope they work. Once the disks are no longer provided by the vendor all bets are off.
Now - I bitch about the APC's and move to consolidate. BUT - this is where things are getting programmed against and regular updates are being applied. The cash isn't flowing to your bases even close to the way it was, but it is flowing to these Orgs. So, that's better. Unfortunately, the service isn't on-par with what can be supplied locally. I'll have another post about consolidation, security and cyber later.
It's Friday and my D&D group is starting. Hope this answered your question, I rambled a bit.
EDIT -
TL;DR - Regulations, Money, old tech and specialized equipment make PST's on the network shares bad. But mostly expensive old specialized equipment.
Also, I'm trying to spell out all the acronyms, but if I miss one let me know.