Lower DNS TTLs before an email cutover
Mail records cached for a day keep delivering to the old system after the switch. We lower DNS time to live values a day or two ahead, so the cutover lands in minutes.
GABCO field practice

GABCO Enterprises delivers defined IT projects for Cayman organisations: migrations, business application implementations, upgrades and office moves. Every project gets a named lead, a written plan and regular status reports. You always know where it stands.
Most technology change arrives as a project: a new practice management or billing system, a move to Microsoft 365, a data centre migration, an upgrade, a new office. Projects carry real business risk. When they slip, the cost shows up in lost productivity, disrupted clients and shaken staff confidence.
GABCO Enterprises brings experienced project leadership and business analysis to deliver change on time, on budget and to scope. We sit on your side of the table: managing vendors, coordinating staff, controlling change and making sure the finished system does what your business needs.
Every project runs on written objectives, a plan, a risk log and regular status reports. Leadership always has an accurate picture of progress and issues. No surprises.
Who it is for. Organisations with a project to deliver and no spare capacity or specialist experience to run it. We often sit on the client's side of the table when a vendor is delivering software, owning scope, testing and acceptance.
Each guide covers one part of the service: what it involves, how we deliver it and what you receive.
Facts and practices that rarely make it into a proposal, but decide how well the work holds up.
Mail records cached for a day keep delivering to the old system after the switch. We lower DNS time to live values a day or two ahead, so the cutover lands in minutes.
GABCO field practice
Personal archive files, oversized mailboxes and shared mailbox permissions cause most migration delays. We inventory them first, then size the timeline.
GABCO field practice
Microsoft ended support for Exchange Server 2016 and 2019 on 14 October 2025. On premises mail servers still running them should already be moving.
Source: Microsoft Lifecycle Policy
We keep the source system available read only for at least 30 days after cutover, so a missing folder or report is a lookup, not a recovery project.
GABCO field practice
Tell us what you're working on. We'll listen, ask the right questions and recommend a practical next step. No obligation.