What you’re seeing
- Your organization still runs mail on Exchange Server 2016 or Exchange Server 2019 on its own hardware.
- Microsoft's support for these versions ended in October 2025, so no new security updates are being released.
- Cyber insurance renewals or security questionnaires are asking whether you run unsupported software.
- Vendors or auditors are flagging the server, and nobody is sure what the next step is.
Common causes
Every environment is different, but these are the causes our engineers find most often:
- Exchange 2016 and 2019 reached the end of their support life cycle, and Microsoft no longer patches them.
- Migration was postponed because the server kept working and the project seemed large or costly.
- The server still hosts things besides mailboxes, such as relay for scanners or hybrid management, which complicates retiring it.
- Line-of-business applications depend on the on-premises server, so moving away needs planning.
Why it matters
On-premises Exchange servers are frequent targets for attackers, and new vulnerabilities will no longer be patched on these versions. A single exploited flaw can expose every mailbox in the company, enable ransomware or make your server a launch point for attacks on others. Running unsupported software can also put cyber insurance coverage and compliance obligations at risk, and the cost of an emergency migration after an incident is far higher than a planned one.
How AskTechGurus fixes it
Skip the trial and error. A certified engineer works on your actual system, finds the root cause, and fixes it properly.
Tell us what’s happening
Submit a ticket in about two minutes. Paste the error, describe what changed, and pick your tier. No charge to submit.
A certified engineer diagnoses it
A vetted, US-based systems engineer claims your ticket, usually within minutes during business hours, and investigates over a secure remote session you can watch and end at any time.
Fixed and verified with you
The engineer resolves the root cause and confirms with you that it’s working. You don’t just get a workaround, and you get a plain-English summary of what was wrong.
Pay only when it’s resolved
Fixed price from $99, invoiced only after you approve the fix. If it isn’t resolved, you don’t pay.
Frequently asked questions
Will our email stop working now that support has ended?
No, the server keeps running. The problem is that new security holes won't be fixed, so the risk grows over time.
Do we have to move to Microsoft 365?
Not necessarily. The options include moving to Microsoft 365 or upgrading to the current on-premises Exchange version. Our engineer will explain the trade-offs for your size and requirements.
Can the move be done without email downtime?
In most cases, yes. Mailbox moves can be staged so users keep working, and we confirm what your current server is doing before anything is changed.