If your business runs Mitel MiCloud Connect or MiVoice Office 250, two deadlines that have been on the calendar for months just passed. This isn't a future-tense warning. As of this article, both cutoffs are already behind us, and where that leaves you depends entirely on whether your migration was already done.
MiCloud Connect: the shutdown already happened
MiCloud Connect — Mitel's hosted cloud UCaaS platform — was permanently disconnected at 11:59 PM Pacific time on June 24, 2026. There was no grace period. Calls stopped immediately. Any call recordings, voicemails, or call-flow configurations that hadn't been manually downloaded beforehand were purged, with no recovery possible after the fact.
The backstory matters here. RingCentral acquired MiCloud Connect and Mitel's cloud customer base in July 2024, after having separately paid roughly $650 million for an earlier exclusive UCaaS partnership with Mitel — and reportedly bought the customer base back for around $30 million once that partnership was, in reporting at the time, described in bankruptcy proceedings as having faced numerous disputes. RingCentral's own public guidance recommended that affected businesses have a new provider selected by January 1, 2026, to leave enough runway for number porting, configuration, and staff training. Any business still actively migrating after that date was already operating in a compressed timeline RingCentral itself had warned against — and porting alone, for accounts with more than 100 numbers, can commonly take six weeks or longer.
If your MiCloud Connect migration wasn't complete before June 24: your numbers may currently be caught in the gap between systems — no longer live on Mitel, not yet ported to a new provider. This is fixable, but it needs to be treated as the priority it is, not a routine project.
MiVoice Office 250: the last support cliff
Separately, June 30, 2026 marked the end of all technical support for MiVoice Office 250 — the final milestone in a phase-out that Mitel actually announced back in 2022. The earlier milestones had already passed for years: new system sales ended January 2022, add-on sales ended June 2022, software design ended January 2023, and device license sales ended June 2024. June 30, 2026 was the last one: after that date, there is no more official Mitel troubleshooting, patching, or hardware assistance of any kind for a system many businesses have run for 15 to 20 years.
The system does not stop working the day support ends. That's exactly the risk. A MiVoice Office 250 system still online today runs with every future vulnerability permanently unpatched — it keeps functioning while becoming a progressively more attractive, completely unprotected target, with no one at Mitel obligated to fix anything that goes wrong.
What about MiVoice Connect and MiVoice Business?
If you're on a different Mitel platform, the timeline is different but not necessarily more comfortable:
- MiVoice Connect (formerly ShoreTel): lost all security patches and OS updates on December 31, 2025, and is now running in maintenance-only mode. Hardware repair support continues through December 31, 2028, with all support ending December 31, 2029. New system sales ended July 2024; add-on sales ended December 2024.
- MiVoice Business (3300 ICP platform): currently has no published end-of-life date, making it Mitel's most stable current offering. That said, it is sold by a company that filed Chapter 11 bankruptcy in March 2025 to restructure $1.15 billion in debt, and has cycled through UCaaS partnerships — an exclusive RingCentral arrangement, followed by a realignment toward Zoom for unified communications. "No published EOL" and "safe indefinitely" are different statements.
Why the bankruptcy matters even for supported products
Mitel's Chapter 11 filing in March 2025 doesn't retroactively change any published EOL date. What it does change is the confidence a business can reasonably have in long-term product investment and support quality going forward, for any Mitel platform, published EOL date or not. A vendor restructuring over a billion dollars in debt while shifting UC partners is not the same bet it was five years ago.
What a realistic migration actually looks like
The most common mistake in EOL migrations isn't choosing the wrong replacement platform — it's underestimating number porting time and treating the cutover as a single weekend project instead of a phased one. A few things matter more than which specific alternative you choose:
- Start number porting immediately if you haven't. Porting for accounts with 100+ numbers commonly takes six weeks or more. If you're reading this after either deadline has passed, this is the critical path.
- Download anything still retrievable now, not later. If any part of your system is still accessible, pull call recordings, voicemails, and configuration data before it becomes unavailable.
- Run dual-line during cutover. A migration where inbound calls are never dropped requires overlapping service on the old and new systems during the transition, not a hard cutover.
- Plan for training time, not just technical cutover. Staff need to know how the new system actually works before day one, not after.
What migrating to VoIP International looks like specifically
We operate our own platform with direct carrier contracts — not a platform recently reassigned between corporate owners, and not a company in active bankruptcy restructuring. Pricing is published, month-to-month with no long-term contract required. Number porting is a flat $15 per number, both directions. See our dedicated Mitel replacement guide for platform-specific migration paths from MiCloud Connect, MiVoice Office 250, or MiVoice Business.
Frequently asked questions
My MiCloud Connect account was shut down on June 24. What do I do now?
If your migration wasn't complete before the shutdown, your priority is getting a new provider active and your numbers ported as quickly as possible — this is an active outage, not a project to schedule for next quarter. Any data not downloaded before the shutdown is not recoverable from Mitel.
Is MiVoice Office 250 completely unusable after June 30, 2026?
No, the system continues operating. What ends is official Mitel support — no patches, no troubleshooting, no hardware assistance. The system becomes progressively riskier to keep running, not immediately non-functional.
Should I migrate off MiVoice Business even though it has no published EOL date?
That depends on your risk tolerance. MiVoice Business currently has no announced end-of-life, but it's sold by a company in Chapter 11 bankruptcy restructuring with a recent history of shifting UC partnerships. Many businesses are treating this as a reasonable short-term position while planning a longer-term evaluation.
How long does a realistic migration actually take?
Number porting alone can take six weeks or more for larger number counts. A realistic full migration, including configuration, dual-line cutover, and staff training, is measured in weeks, not days — which is exactly why waiting until an EOL deadline arrives to start is the most expensive way to do it.
Talk through where you actually stand
Tell us which Mitel platform you're on and whether your migration is already underway. We'll give you a straight read on urgency and what a realistic timeline looks like from here.
Sources referenced in this article: RingCentral/Mitel MiCloud Connect shutdown announcements and timeline reporting, 2026; Mitel MiVoice Office 250 end-of-life announcement and milestone timeline; Mitel MiVoice Connect end-of-life documentation; independent 2026 reporting on Mitel's Chapter 11 bankruptcy filing and UCaaS partnership changes.